Underwater optical communication system based on high sensitivity detector

At present, the underwater high-speed wireless optical communication technology has become the research hotspot of underwater wireless data communication, which is favored by more and more scholars. Aiming at the technical difficulties of long distance and easy alignment of underwater optical communication, an underwater optical communication system with large receiving field of view angle and high sensitivity detection circuit based on blue-green light emitting diode (LED) light source was designed and realized. In this proposed system, the transmitting optical power reaches 1.2 W, the receiving field of view angle is more than 60°, and the detection sensitivity is better than −60 dBm. Through the test of principle engineering prototype, the results show that in the water environment with water quality attenuation degree of 0.85 dBm·m⁻¹, the proposed system can realize the high-speed transmission of text, pictures, real-time video data streams, etc. The data transmission rate is 10 Mb/s, the communication distance is 40 m, and the communication bit error rate is zero.